Aircast Cryo/Cuff Knee Self Contained is a cold therapy cast for relieving pain en swelling in the knee. Can be used for multiple knee injuries, such as knee ligament sprains, cartilage tears, and ACL injuries; and following knee arthroscopy and knee surgery. Because it is self contained, there is no seperate cooler needed. The knee cast will provide one hour of cold therapy after being filled with water and ice. One size fits all.